Copied from Fedora.

http://pkgs.fedoraproject.org/cgit/libwmf.git/tree/libwmf-0.2.8.4-CAN-2004-0941.patch

--- libwmf-0.2.8.4/src/extra/gd/gd_png.c	2004-11-11 14:02:37.407589824 -0500
+++ libwmf-0.2.8.4/src/extra/gd/gd_png.c	2004-11-11 14:04:29.672522960 -0500
@@ -188,6 +188,14 @@
 
   png_get_IHDR (png_ptr, info_ptr, &width, &height, &bit_depth, &color_type,
 		&interlace_type, NULL, NULL);
+  if (overflow2(sizeof (int), width)) 
+    {
+      return NULL;
+    }
+  if (overflow2(sizeof (int) * width, height)) 
+    {
+      return NULL;
+    }  
   if ((color_type == PNG_COLOR_TYPE_RGB) ||
       (color_type == PNG_COLOR_TYPE_RGB_ALPHA))
     {
12114067b9aeb468929cf380'/><select name='h' onchange='this.form.submit();'>
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<tr><td class='sub'>Wojtek's customized Guix</td><td class='sub right'></td></tr></table>
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<div class='path'>path: <a href='/guix/log/?id=1ba126e0e4873f6012114067b9aeb468929cf380'>root</a>/<a href='/guix/log/tests?id=1ba126e0e4873f6012114067b9aeb468929cf380'>tests</a>/<a href='/guix/log/tests/guix-register.sh?id=1ba126e0e4873f6012114067b9aeb468929cf380'>guix-register.sh</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/guix/log/tests/guix-register.sh?id=1ba126e0e4873f6012114067b9aeb468929cf380&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th></tr>
<tr><td><span title='2016-07-29 11:39:30 +0200'>2016-07-29</span></td><td><a href='/guix/commit/tests/guix-register.sh?id=57c7e46d391bea11cacf44f9743c721c070bd3a8'>tests: Improve synchronization in 'tests/guix-register.sh'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-06-10 13:47:58 +0200'>2015-06-10</span></td><td><a href='/guix/commit/tests/guix-register.sh?id=369755847b942806efe710b88146311849046017'>guix-register: Perform deduplication even when --prefix is passed.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2015-06-10 11:11:52 +0200'>2015-06-10</span></td><td><a href='/guix/commit/tests/guix-register.sh?id=4ae1fe14b90dba3b3394852079783ca43272a675'>tests: Make the daemon socket explicit in guix-register test.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>